Electric heater



July 30, 1 929.

ELECTRIC HEATER Filed Feb. 27, 1928 E. s JOHNSON 1,722,579

thereon. 1 0

Patentedduly 30,1929. v

-UNITED STATES PATEwT OFFICE.

JOHNSON, 0F WEBSTER CITY, IOWA, ASSIGN'OR TO KNAPP-MONAIRCH COM-- PANY, OF ST, LOUIS, MISSOURI, A'CORPORATION OF MISSOURI. A

ELECTRIC HEATER.

Application filed February 27, 1928. ,SeritlNo. 257,256

The object of my invention is to provide an electric heater of simple, durable and comparatively inexpensive construction.

More particularly it is my object to provide an electric heater wherein the heating element is adapted to be mounted upon a pair of terminal posts whereby it may be readily removed from the terminal posts or placed Still a further object is to provide aheatving element including a core of non-conducting material having a pair of spaced openings therein adapted to receive the ends of a pair of terminal posts,the core having an electric resistance wire mounted thereon having the scribed, it will be seen that the two posts 16 ends thereof extended into the openings in said core whereby the core may be both supported on the terminal posts and at the same time, the resistance wire is contacted thereto.

Still a furtherobject is to provide a heating element which is adapted to be supported on a pair of terminal posts, the terminal posts also serving as a means for transmitting electric current to the resistance wire forming a part of the heating element. With these and other objects in view my invention consists in the construction, ar-

rangement and combination of the various parts of my device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims and illustrated in the accompanying drawings, in which Figure 1 is a perspective view of my improved heater.

Figure 2 is a central vertical sectional view through the same.

Figure 3 is a horizontal sectional view taken on the line 33 of Figure 2.

Figure 1 is a perspective view of the heating element; and

Figure 5 is a detail sectional view talren on the line 5-5 of Figure 1.

In the accompanying drawings I have used flector bowl or shell 12. The bowl or shell 12 has mounted thereon aguard 14. The guard 14 is iormedof a number of spring wires adapted'to extend over the periphery of the shell 12 and to be retained thereon by the resiliency of the wires themselves.

Within the shell 12 is mounted a pair of terminal posts 16 and 18. The posts 16 and 18 project through a pair of insulating elements or sleeves 20 which are mounted within the shell 12. The terminal posts have nuts 22 and 24 mounted on each side of the insulating sleeve 20 wherein the posts are prop erly positioned and held relative to the shell 12.

On the outside of the shell 12 is a smalh the shell 20 and has one line connected to thebinding posts 16 and its other line connected to the binding posts 18.

From the construction of the parts just deand 18 are included inan eletric circuit. The two posts 16 and 18 project into the shell'12 for a considerable portion of their length. Upon the posts 16 and 18 T mount a heating unit A. The heating unit A includes a core 30. The core is of a nonconducting or insulating material such as porcelain, lava or the like.

In the drawings Ilhave shown the core as tubular in outline and having a short connecting partition 32 near its rear end. Within the partition 32 is formed a pair of'openings 3%. Within each of the openings 341 I mount a sleeve 36 of conducting material. On each side of the partition 32 and retained by the sleeve 36 is a washer 38.

An electric resistance wire 40 is wound around the exterior of the core 30 in grooves 42 formed in the core 30. One end of the resistance wire 10 is connected to one of the sleeves 36 in one of the openings 34-. The.

other end of the same resistance wire 10 passes around a notch 14: formed in the outer edge of the core 30 and is connected to the other sleeve 36 on the innerside thereof.

It will he seen that the resistance wire has "its ends connected to the sleeves 36 so. that the resistance wire and core 30 form a complete heating unit or element adapted to be mounted upon the terminal posts 16 and 18. The sleeves 36 are of sufficient size to allow the terminal posts 16 and 18 to be inserted therein as clearly shown in Figures 2 and 3 of the drawings.

The postm 16 and 18 coming in contact with the sleeves 36 serve to transmit the electric current to the sleeves 36 and to the resistance wire 40. The entire assembly or heating unit A may be removed from the posts 16 and 18 when desired.

The partition 32 in the core 30 does not fill the entire end thereof but is cut-short so that a pair of ventilating openings 46 are formed wherein a circulation of air may be had longitudinally through the core 30.

One of the advantages of my structure resides in the heating unit which is adapted to be mounted on a pair of terminal posts and through such posts the heating unit is included in the electric circuit.

Some changes may be made in the construction and arrangement of the. parts of my device without departing from the real spirit and purpose of my invention and it is my intention to cover by my claims, anymodified forms of structure or use of mechanical equivalents, which may be reasonably included Within their scope.

I claim as my invention 1. In a device of the class described, a

vpair of spacedterminal posts insulated from each other, a heating unit comprising a tube like core of non-conducting material having an end ,member, a pair of spaced openmgs therein, sleeves of conducting material mounted in said openings said sleeves having flared ends for retaining them in the openings in said end member and an electric reslstance wire mounted on sald core and having each end connected to one of said 30 sleeves by extending under one of the flared ends thereof, said sleeves being adapted to receive said terminal posts whereby the heating unit is supported thereby and electrically connected thereto.

2. In a device of the class described, a reflector, a pair of spaced terminal posts inends of said Wire connected thereto for contacting with said posts when said member is supported thereon and openings in said end disc to allow reflected heat to pass therethrough and thence through said. tubular 50 member.

Des Moines, Iowa, February 6, 1928.

ERNEST sjJoHNsoN. 

